<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
        input{
            width: 200px;
            height: 30px;
            margin: 10px;
            border: 1px solid #6ebeff;
            border-radius: 5px;
            padding: 5px;
        }
        button{
            width: 100px;
            height: 30px;
            border: 1px solid #ccc;
            border-radius: 5px;
            background-color: #ccc;
            margin: 10px;
        }
        input:focus{
            border: 1px solid #87ee97;
            outline: none;
        }
        [placeholder="手机号"]{
            color: #f21111;
        }
        .logo{
            width: 300px;
            height: 300px;
            background-image: url(./img/OIP-C.jpg);
            position: relative;
        }
        .logo::after{
            content: "6";
            width: 50px;
            height: 50px;
            background-color: #ff0000;
            display: block;
            position: absolute;
            color: #ffffff;
            text-align: center;
            line-height: 50px;
            border-radius: 50%;
            right: -5px;
            top: 20px;
        }
    </style>
</head>
<body>
    <input type="text"placeholder="账号" />
    <input type="password"placeholder="密码" />
    <input type="text"placeholder="手机号" />
    <button>登陆</button>

    <div class="logo">  </div>
</body>
</html>